From cf9a910a8ac380ded3fb4b0d8ff9ecf3cf00c078 Mon Sep 17 00:00:00 2001
From: dbv <dbv@opencascade.com>
Date: Wed, 21 Mar 2012 15:16:30 +0400
Subject: [PATCH] 0023033: Standard_MMgrOpt::Reallocate behavior must be
 similar to "realloc"

Changes :
Standard_MMgrOpt::Reallocate has been modified to allocate new memory block if NULL pointer has been passed.
---
 src/Standard/Standard_MMgrOpt.cxx | 6 ++++++
 src/Standard/Standard_MMgrOpt.hxx | 3 ++-
 2 files changed, 8 insertions(+), 1 deletion(-)

diff --git a/src/Standard/Standard_MMgrOpt.cxx b/src/Standard/Standard_MMgrOpt.cxx
index bcb39e139c..ce8751a611 100755
--- a/src/Standard/Standard_MMgrOpt.cxx
+++ b/src/Standard/Standard_MMgrOpt.cxx
@@ -718,6 +718,12 @@ void Standard_MMgrOpt::FreePools()
 Standard_Address Standard_MMgrOpt::Reallocate(Standard_Address&   theStorage,
                                               const Standard_Size theNewSize)
 {
+  // if theStorage == NULL, just allocate new memory block
+  if (!theStorage)
+  {
+    return Allocate(theNewSize);
+  }
+  
   Standard_Size * aBlock = GET_BLOCK(theStorage);
   Standard_Address newStorage = NULL;
 
diff --git a/src/Standard/Standard_MMgrOpt.hxx b/src/Standard/Standard_MMgrOpt.hxx
index d7a626c3f1..dcbcb4e3d7 100755
--- a/src/Standard/Standard_MMgrOpt.hxx
+++ b/src/Standard/Standard_MMgrOpt.hxx
@@ -104,7 +104,8 @@ class Standard_MMgrOpt : public Standard_MMgrRoot
   //! Allocate aSize bytes; see class description above
   Standard_EXPORT virtual Standard_Address Allocate(const Standard_Size aSize);
   
-  //! Reallocate previously allocated aPtr to a new size; aPtr is nullified
+  //! Reallocate previously allocated aPtr to a new size; aPtr is nullified.
+  //! In case that aPtr is null, the function behaves exactly as Allocate.
   Standard_EXPORT virtual Standard_Address Reallocate(Standard_Address& aPtr, 
                                                       const Standard_Size aSize);